5. It seems, according to what I have just said, that there is often some confusion in the expressions of those who set at variance philosophy and theology, or faith and reason: they confuse the terms 'explain', 'comprehend', 'prove', 'uphold'. And I find that M. Bayle, shrewd as he is, is not always free from this confusion. Mysteries may be explained sufficiently to justify belief in them; but one cannot comprehend them, nor give understanding of how they come to pass. Thus even in natural philosophy we explain up to a certain point sundry perceptible qualities, but in an imperfect manner, for we do not comprehend them. Nor is it possible for us, either, to prove Mysteries by reason; for all that which can be proved a priori, or by pure reason, can be comprehended. All that remains for us then, after having believed in the Mysteries by reason of the proofs of the truth of religion (which are called 'motives of credibility') is to be able to uphold them against objections. Without that our belief in them would have no firm foundation; for all that which can be refuted in a sound and conclusive manner cannot but be false. And such proofs of the truth of religion as can give only a moral certainty would be balanced and even outweighed by such objections as would give an absolute certainty, provided they were convincing and altogether conclusive. This little might suffice me to remove the difficulties concerning the use of reason and philosophy in relation to religion if one had not to deal all too often with prejudiced persons. But as the subject is important and it has fallen into a state of confusion, it will be well to take it in greater detail.
6. The question of the conformity of faith with reason has always been a great problem. In the primitive Church the ablest Christian authors adapted themselves to the ideas of the Platonists, which were the most acceptable to them, and were at that time most generally in favour. Little by little Aristotle took the place of Plato, when the taste for systems began to prevail, and when theology itself became more systematic, owing to the decisions of the General Councils, which provided precise and positive formularies. St. Augustine, Boethius and Cassiodorus in the West, and
St. John of Damascus in the East contributed most towards reducing theology to scientific form, not to mention Bede, Alcuin, St. Anselm and some other theologians versed in philosophy. Finally came the Schoolmen. The leisure of the cloisters giving full scope for speculation, which was assisted by Aristotle's philosophy translated from the Arabic, there was formed at last a compound of theology and philosophy wherein most of the questions arose from the trouble that was taken to reconcile faith with reason. But this had not met with the full success hoped for, because theology had been much corrupted by the unhappiness of the times, by ignorance and obstinacy. Moreover, philosophy, in addition to its own faults, which were very great, found itself burdened with those of theology, which in its turn was suffering from association with a philosophy that was very obscure and very imperfect. One must confess, notwithstanding, with the incomparable Grotius, that there is sometimes gold hidden under the rubbish of the monks' barbarous Latin. I have therefore oft-times wished that a man of talent, whose office had necessitated his learning the language of the Schoolmen, had chosen to extract thence whatever is of worth, and that another Petau or Thomasius had done in respect of the Schoolmen what these two learned men have done in respect of the Fathers. It would be a very curious work, and very important for ecclesiastical history, and it would continue the History of Dogmas up to the time of the Revival of Letters (owing to which the aspect of things has changed) and even beyond that point. For sundry dogmas, such as those of physical predetermination, of mediate knowledge, philosophical sin, objective precisions, and many other dogmas in speculative theology and even in the practical theology of cases of conscience, came into currency even after the Council of Trent.
7. A little before these changes, and before the great schism in the West that still endures, there was in Italy a sect of philosophers which disputed this conformity of faith with reason which I maintain. They were dubbed 'Averroists' because they were adherents of a famous Arab author, who was called the Commentator by pre-eminence, and who appeared to be the one of all his race that penetrated furthest into Aristotle's meaning. This Commentator, extending what Greek expositors had already taught, maintained that according to Aristotle, and even according to reason (and at that time the two were considered almost identical)
there was no case for the immortality of the soul. Here is his reasoning. The human kind is eternal, according to Aristotle, therefore if individual souls die not, one must resort to the metempsychosis rejected by that philosopher. Or, if there are always new souls, one must admit the infinity of these souls existing from all eternity; but actual infinity is impossible, according to the doctrine of the same Aristotle. Therefore it is a necessary conclusion that the souls, that is, the forms of organic bodies, must perish with the bodies, or at least this must happen to the passive understanding that belongs to each one individually. Thus there will only remain the active understanding common to all men, which according to Aristotle comes from outside, and which must work wheresoever the organs are suitably disposed; even as the wind produces a kind of music when it is blown into properly adjusted organ pipes.
8. Nothing could have been weaker than this would-be proof. It is not true that Aristotle refuted metempsychosis, or that he proved the eternity of the human kind; and after all, it is quite untrue that an actual infinity is impossible. Yet this proof passed as irresistible amongst Aristotelians, and induced in them the belief that there was a certain sublunary intelligence and that our active intellect was produced by participation in it. But others who adhered less to Aristotle went so far as to advocate a universal soul forming the ocean of all individual souls, and believed this universal soul alone capable of subsisting, whilst individual souls are born and die. According to this opinion the souls of animals are born by being separated like drops from their ocean, when they find a body which they can animate; and they die by being reunited to the ocean of souls when the body is destroyed, as streams are lost in the sea. Many even went so far as to believe that God is that universal soul, although others thought that this soul was subordinate and created. This bad doctrine is very ancient and apt to dazzle the common herd. It is expressed in these beautiful lines of Vergil (Aen., VI, v. 724):
Principio coelum ac terram camposque liquentes,
Lucentemque globum Lunae Titaniaque astra,
Spiritus intus alit, totamque infusa per artus
Mens agitat molem, et magno se corpore miscet.